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Theresa May’s announcement that she was delaying a key vote on her Brexit deal in order to renegotiate with Brussels spooked the markets yesterday, sending the pound crashing to its lowest level in 20 months.

Sterling was 1.44pc down against the dollar at $1.2551 at the close of trade and 1.11pc lower against the euro at €1.1056.

It has had a rollercoaster ride since Britain decided to leave the EU in June 2016, with many of its sharpest fluctuations centred around the Prime Minister.